Senescence, apoptosis or autophagy? When a damaged cell must decide its path--a mini-review
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Published on: October 11, 2012
José Miguel Vicencio1, Lorenzo Galluzzi, Nicolas Tajeddine
1INSERM, U848, Paris, France.
Abstract:
Many features of aging result from the incapacity of cells to adapt to stress conditions. When damage accumulates irreversibly, mitotic cells from renewable tissues rely on either of two mechanisms to avoid replication. They can permanently arrest the cell cycle (cellular senescence) or trigger cell death programs. Apoptosis (self-killing) is the best-described form of programmed cell death, but autophagy (self-eating), which is a lysosomal degradation pathway essential for homeostasis, reportedly contributes to cell death as well. Unlike mitotic cells, postmitotic cells like neurons or cardiomyocytes cannot become senescent since they are already terminally differentiated. The fate of these cells entirely depends on their ability to cope with stress. Autophagy then operates as a major homeostatic mechanism to eliminate damaged organelles, long-lived or aberrant proteins and superfluous portions of the cytoplasm. In this mini-review, we briefly summarize the molecular networks that allow damaged cells either to adapt to stress or to engage in programmed-cell-death pathways.
Insights
Cells adapt to stress by arresting division or undergoing programmed cell death, including apoptosis and autophagy. This review summarizes molecular pathways for cellular stress adaptation and death.
Area of Science:
- Cellular Biology
- Molecular Biology
- Aging Research
Background:
- Cellular stress response is crucial for aging.
- Mitotic cells can enter senescence or cell death pathways.
- Postmitotic cells rely on stress adaptation mechanisms like autophagy.
Purpose of the Study:
- To review molecular networks governing cellular adaptation to stress.
- To explore programmed cell death pathways in response to damage.
- To differentiate stress responses in mitotic versus postmitotic cells.
Main Methods:
- Literature review of cellular stress response mechanisms.
- Analysis of molecular pathways involved in senescence, apoptosis, and autophagy.
- Comparison of stress adaptation strategies in different cell types.
Main Results:
- Cells employ senescence or programmed cell death (apoptosis, autophagy) to manage irreversible damage.
- Autophagy is a key homeostatic mechanism for postmitotic cells, clearing damaged components.
- Molecular networks dictate whether cells adapt to stress or initiate death programs.
Conclusions:
- Cellular stress adaptation and death pathways are critical for organismal health during aging.
- Understanding these pathways offers insights into age-related cellular dysfunction.
- Targeting these molecular networks may provide therapeutic avenues for age-related diseases.
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